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The National Day of Catalonia (Diada Nacional de Catalunya) is a day-long festival in Catalonia. It commemorates the defeat of the Catalan troops fighting during the War of the Spanish Succession. The Catalan troops that fought in support of the Habsburg dynasty's claim to the Spanish throne were defeated at the Siege of Barcelona by the army of the Bourbon king Philip V of Spain on 11 September 1714 after 14 months of siege. The holiday was first celebrated in 11 September 1886
The Palau de la Generalitat in Barcelona is the seat of the Catalan government. The Palau has pure Gothic, flamboyant Gothic, Renaissance and baroque elements behind the neoclassical façade. The building was constructed between the 15th and mid-17th centuries and these accounts for the variety of architectural styles. The delicate beauty of the Pati dels Tarongers, the courtyard planted with orange trees is particularly outstanding.